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Chapter 11. Configuration
Remote hosts: As mentioned in the example earlier, you might want to point a hostname such as "www" to a remote system. While
"www" is created by default, you can create other names such as "home", "research", or any other appropriate name. In the form, you
simply enter the hostname, choose the domain, and enter the remote IP address.
Local hosts: This screen is a bit more complicated because you have more options. At a basic level, you can create a hostname in a
domain that points to another computer on your local network. To do this, just type in the hostname and enter the IP address in the
"Local IP" field. For instance, you might want "research" to point to a computer system inside your network.
Where this gets complicated is when you want "research.mycompany.xxx" to be accessible both inside and outside your local
network. The challenge is that your local IP addresses are only accessible inside your network. For that reason, the target computer
system will need to have two network interface cards - one connected to the internal network and one connected to the external
network. You would then enter both IP addresses in this screen in the "Local IP" and "Global IP" fields. Note that this will only work
if you are a ServiceLink subscriber as the server alone does not update public DNS information.
Note: The "Ethernet address" field when creating a hostname pointing to a local host is only used for reserving IP addresses
through DHCP as mentioned in the next section.
11.5.2. Reserving IP Addresses Through DHCP
Another task you can perform through this panel is to reserve an IP addresses for a given system based on its Ethernet address. For
instance, you might have another intranet web server within your company that you want to always have the same IP address. One
method of assigning that address is to manually configure the client machine to have a static IP address. The negative aspect of doing
this is that if you later want to change the network settings for that machine, you must manually go and configure that machine. An
example would be if one of your DNS servers changed its IP address. Additionally, you have to keep track somewhere of the fact that
you have assigned a specific IP address to that machine.
Rather than configuring the machine manually, you can reserve an IP address from the DHCP server for that specific machine. This
has the same result as manually configuring a static IP address, but offers two benefits. First, you have one location to keep track of
all assigned static address. Second, through the DHCP server you will provide network settings. If you wish to change those settings,
the change can be simply done on your server. All DHCP clients will then receive those updated changes when they renew their
DHCP-provided addresses.
To reserve an IP address, you must first determine the Ethernet address of your client system. Windows NT/2000 users can type the
command ipconfig /all. Windows 95/98 users can run the command winipcfg. Linux/UNIX users can type ifconfig.
Once you have determined the client’s Ethernet address, click on the link to create a new hostname for a local host. Add the
hostname of the target system, the Ethernet address along with the desired IP address into the web panel. From this point on specified
IP address will only be provided to a client system with the matching Ethernet address.
11.6. E-mail Retrieval
As shown below, this section of the server manager allows you to specify the protocol used to retrieve e-mail from your ISP and
configure other settings regarding the retrieval of e-mail.
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